I NEED A PROGRAMMER'S HELP

Hello, everyone. I recently started working with “Top-Down RPG Starter Kit” from the Asset Store and I need your help. First I want to say that I have tried to connect with the developers, but there was no respond. I want to modify one of the codes in this pack, so if anyone thinks that he can help me get it done, please write here or contact me on this e-mail: thelostsymbol@mail.bg .

( There is a skill system in the pack, but I want to make a skill tree, where if you choose one path, the other one gets locked. )

Please help me!
Thank you very much!

Yes, there will be payment!